/*
 * Copyright 1999-2019 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.chaosblade.exec.common.center;

import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import com.alibaba.chaosblade.exec.common.model.Model;

/**
 * @author Changjun Xiao
 */
public class StatusMetric {
    private Model model;
    private AtomicLong hitCounts;
    private Lock lock = new ReentrantLock();

    public StatusMetric(Model model) {
        this.model = model;
        this.hitCounts = new AtomicLong(0);
    }

    public Model getModel() {
        return model;
    }

    public void increase() {
        hitCounts.incrementAndGet();
    }

    public void decrease() {
        hitCounts.decrementAndGet();
    }

    public boolean increaseWithLock(long limitCount) {
        if (lock.tryLock()) {
            try {
                if (hitCounts.get() < limitCount) {
                    increase();
                    return true;
                }
            } finally {
                lock.unlock();
            }
        }
        return false;
    }

    public long getCount() {
        return hitCounts.get();
    }
}
